Adding AdditiveGroup and PrimeGroup

[autquis]

See arkworks-rs/algebra#577.

I changed Cargo.toml to avoid redoing what arkworks-rs/r1cs-std#122 has done.

closes: #XXXX

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[mmagician]

I would prefer we first merge the r1cs-std PR to not have master here depend on any forks.

[mmaker]

r1cs-std's PR has been merged!

[weikengchen]

Let me update this PR to see if we can get it ready...

[drskalman]

@weikengchen: we also need this arkworks-rs/r1cs-std#122, right? bandersnatch tests are failing to compile due to that.

[mmaker]

any news on this?

[mmaker]

ping.
this is causing problems for the folks at https://github.com/zkCollective/ and I need it for a presentation at DEF CON.